This document describes the design of a multi-purpose planar antenna that can operate in multiple frequency bands including DCS, WiBro, Bluetooth, wireless LAN, and ISM. The antenna was designed with an open-loop structure transformed from a monopole antenna. It has advantages such as small size, low cost, light weight, and higher gain than existing antennas. The antenna's resonance frequency and bandwidth can be adjusted by changing the gap and height of the open loop. Measurement results showed the antenna achieved bandwidths of 1.745-1.891GHz and 2.469-2.750GHz, satisfying the needs of the target frequency bands. Radiation patterns and current distributions were also simulated.

1. International Journal of Electrical and Computing Engineering
Vol. 1, Issue. 1, July – 2014 ISSN (Online): 2349-8218
36
DESIGN OF A MULTI-PURPOSE PLANAR ANTENNA
R. Vignesh Ram1
, O. P. Saravana Priyan2
1,2
Department of Electronics and Communication, Thiagarajar College of Engineering
Thiruparankundram, INDIA
ABSTRACT:
In this study, we have designed a multi-purpose
planar antenna for DCS, WiBro ,and ISM. The
proposed antenna was designed as an open-loop
antenna that was transformed from a monopole
antenna structure. The capacitance of the multi-
purpose antenna was increased by the coupling of
open gap. This antenna has many advantages such
as smaller size , lower cost , more light weight , and
higher gain than existing antennas . The resonance
frequency and bandwidth can be adjusted by change
of the gap and the height of the open loop antenna.
The bandwidth of the designed antenna is satisfied
with DCS, WiBro, bluetooth, wireless LAN and ISM
bands. The frequency range is 1.745-1.891GHz
(1.807GHz) and 2.469-2.750GHz (2.573GHZ).This
antenna was used in WLAN and Mobile
application.
1. Introduction:
Of the many factors that determine the quality of
wireless communications, the characteristics of the
antenna is one of the most important factors.
Recently, the type of antenna widely used for mobile
communications is the patch antenna or helical and
monopole antenna. patch antennas antenna are widely
used for antenna elements because they can be
manufactured easily [2]. However, their bandwidth is
narrow and the size of the patch is λ/2 of the
resonance frequency wavelength. So the size of the
antenna has a problem at a low frequency band. Such
problems can be resolved by using substrate
materials , advancing the manufacturing technology
and varying design method [1]. Nowadays the rapid
development of mobile communication needs a
multi-resonance antenna satisfied not only existing
service bands but the new developed frequency
bands. Therefore, this study was proposed an open-
loop antenna structure and designed a wide antenna
that is generated multi resonance at DCS, WiBro,
Bluetooth, wireless LAN and ISM bands. In this
paper, I proposed a new structure of antenna using
microstrip line.
2. Antenna structure:
The geometry of multi-purpose antenna is illustrated
in fig.The structure of the antenna is designed an
open –loop antenna that was transformed a monopole
antenna structure.In general the parasitic element that
is generated waveguide feed line and radiation patch
affects matching. In this study, we fixed S=2.3[mm]
and among L1,L2,L3,length of L2 was the most
influenced by antenna characteristics.Therefore
length of L2 was changed from 12[mm] to 24[mm].
Fig. 1. The geometry of printed a multi-purpose
planar antenna
3. Fabrication and measurement:
The antenna was printed on an FR-4 substrate of
thickness h=1.6[mm] and relative permittivity 4.6
and loss tangent 0.002.Table shows the parameter
values of the multi-purpose planar antenna.

2. International Journal of Electrical and Computing Engineering
Vol. 1, Issue. 1, July – 2014 ISSN (Online): 2349-8218
37
3.1 Parameter of multi-purpose planar
antenna:
parameter Value[mm] Parameter Value[mm]
L1 18.5 W1 4
L2 22.5 W2 6
L3 20 W3 6
G 0.8 H 1.6
Fig. 2. The simulated structure of printed multi-
purpose planar antenna
Fig-3 simulation and measurement of return loss
Fig2 shows the simulated planar antenna using
advanced design .In this design I use microstrip line
and FR-4 substrate. Among L1,L2,L3,length of L2
was the most influenced by antenna characteristics in
terms of return loss [3]. The length L2 varies from
12[mm] to 22.5[mm] . Instead of using bottom
ground plane in this design used parallel ground
plane. The measured return loss values proposed
antenna were -41.593dB at 1.807GHz ,-43.744dB at
2.573GHz.
Fig 4. Measured radiation patterns for the
proposed antenna at 1.807GHz

3. International Journal of Electrical and Computing Engineering
Vol. 1, Issue. 1, July – 2014 ISSN (Online): 2349-8218
38
Fig 5. Measured current distribution for the proposed
antenna at 1.807GHz
Fig 6. Measured radiation patterns for the proposed
antenna at 2.573GHz
Fig 7. Measured current distribution for the proposed
antenna at 2.573GHz
Figure4.6, shows the radiation pattern of the multi-
purpose planar antenna and Figure5,7 shows the
current distribution of the planar antenna that were
simulated by ADS software. So the proposed antenna
can be effectively used for mobile communication
system or base station. We can know it has a good
transmission regardless of location and it can be
solved the directional problem.
4. Results and Discussions
1) 1.807GHz application
1. Digital Cellular Service
2. GSM
3. PHS
2)2.573GHz application
1. WLAN and UWB applications
2. WiBro
3. ISM.
4. Bluetooth
This study was designed a multi-purpose
planar antenna. The capacitance of the multi-purpose
antenna was increased by coupling of open loop.
The frequency ranges is 1.745-
1.891GHz(1.807GHz) and 2.469-2.750GHz
(2.573GHz). So the proposed antenna can be
effectively used for WLAN,UWB and mobile
communication system (or) base station application.
I can know it has a good transmission regardless of
location and it can be solved the directional
problem. Therefore, this study was found that this
antenna can be used at DCS, WiBro, Bluetooth,
wireless LAN , GSM-1800, and ISM bands.
REFERENCES
[1] W. Menzel and W. Grabherr,"A microstrip patch-
antenna with coplanar feed line," IEEE
MicrowaveWave lett., vol. 1, pp. 340-342, Nov. 1991.
[2] Kai Fong Lee, Wei Chen, "Advanced in
Microstrip and Printed Antennas", Wiley
Interscience, pp71-109, 1997.
[3] David M.pozar,”microwave & RF design of
wireless systems,” john wiley & sons, 1998.